Multiple-color electric-light bulb



Nov. 22, 1927. 1,649,975

9. M. PARKS MULTIPLE COLOR ELECTRIC LIGHT BULB Filed NOV..24. 1924 l v v v v v v') INVENTOR Gear 49 M.Par1c8 BY mm ATTO R N EY Patented Nov. 22, 1927.

UNITED STATES PATENT OFFICE.

GEORGE M. PARKS, OF SACRAMENTO, CALIFORNIA.

MULTIPLE-COLOR ELECTRIC-LIGHT BULB.

Application'filed November 24, 1924. Serial No. 751,836.

This invention relates to improvements in electric lights of the commonlyused incandescent bulb type.

The principal object of my invention is to provide a bulb having a plurality of light giving filaments therein, and to provide means so that the different filaments when independently lit will cause lights of dif ferent colors to be emitted from the bulb.

A bulb of this character has two main fields of service, in both of which a great saving of space will be effected, over what is necessary at present to obtain similar results, and devices in which my lights are used may therefore be made more compact without loss of efficiency.

One field of service of my improved bulb is in connection with automobile signaling devices. I contemplate using the bulb for main headlight purposes, not only to illuminate the road, but to enable by suitable switch means, colored warning lights being emitted from the headlight to serve as signals to pedestrians as well as drivers of cars ahead. The head-light bulb would of course be used in connection with the main signal iving device, in which my bulb could also Be used to advantage. This bulb would also be extremely useful when made with the proper colors as a combination tail, stop, and

back-up light.

Another sphere of usefulness of my bulb is for electric sign purposes in which alternating and differently colored lighting arrangements or designs are desired.

In devices of this character as now constructed, a separate set of bulbs for each color, each with its own socket, is necessary, (tiaking up considerable room, as will be' evient.

With m bulb a multiple colored display si may e arranged to give the same resu ts as are now obtained, but with a great saving of spaceand number of bulbs over what is now necessary.

These and other objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a pcrusal of the following specification and claim.

The figure on the drawing is a sectional elevation of the referred arrangement of parts of my multiple color bulb greatly enlarged.

5!; Referring now more particularly to the characters of reference on the drawings, the

numeral 1 denotes the outer bulb or globe, of suitable shape and size and made of transparent uncolored glass. This globe is fixed on the usual bayonet or screw lights metal base 2 by cement 3 or the like, as is commonly done. a

Two main leads 4 and 5 of substantial and rigid character project in suitably spaced relation from the base into the globe .for a certain distance, and are connected at their free ends by a filament 6 of common character. The lead 4 is connected direct to the base 2, while the lead 5 is connected to a terminal 7 mounted in connection with but insulated from the base.

Disposed between the filament 6- and the base 2 is another filament 8 connected at one end to the lead 4 and at its other end to a lead 9 which is insulated from the lead 5 and extends to a terminal 10 on the base separated from the terminal 7.

A globe 11 preferably of colored translucent glass surrounds the filament 8.

Disposed between the globe 8 and base 2 is a third filament 12 connected at one end to the lead 4 and at its other end to a lead 13 insulated from both leads 5 and 9 and extending to an independent terminal 14 on the base.

Surrounding the filament 12 is a lobe 15 separated from the globe 11 and o a different color from the latter. The globes 11 and 15 are shown as enveloping adjacent parts of the leads 4 and 5 so that the latter form supports for said globes. The particular manner in which the globes are formed, however, or their particular location, forms no part of this invention. However, the particular arrangement of the globes as shown I believe to be the best, especially in connection with a reflector such as is used in connection with motor vehicle service.

The globes 11 and 15 preferably-have openeffect, and without some means of providing circulation and ventilation these interior globes are apt to become overheated.

With the above described arrangement of parts it will therefore be seen that when a circuit is closed through the base and any other of the terminals 7, 10 or 14, the corresponding filament will be lit, and a light having the same color as the globe in Which the lit filament is enclosed, will be emitted from the main uncolored globe just as eflectively as though a se arate and single lightv were employed for t e purpose, as is now done.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein. 7

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from suchdetail may be resortedto as do not form .a departure from the spirit of the invention,

as defined by the appended claim.

Having thus described my invention What I claim as new and useful and desired to secure by'Letters Patent is:

A light bulb comprising a main globe, filaments therein, and an interior globe enclosed within the main globe and surrounding one:

of the filaments, said interior globe having opposed openings in the form of louvres,

whereby to induce a circulation of gases from the main globe through the interior globe.

In testimony whereof I aflix my signature.

GEORGE M. PARKS. 

